三维地震纵波叠前资料裂缝检测方法及应用效果  

Method and application effect of 3D seismic P wave prestack data crack detection

作　　者：王成礼[1,2] 吕功训 WANG Chengli;LU.Gongxun(Shengli Branch Co.of Petroleum Engineering Geophysical Co.,SINOPEC,Dongying Shandong 257100,China;Shanghai Jindi Software Development Co.,Ltd.,Shanghai 200082,China;PetroChina Company Limited,Beijing 100007,China)

机构地区：[1]中国石化地球物理公司胜利分公司,山东东营257100 [2]上海锦迪软件开发有限公司,上海200082 [3]中国石油天然气股份有限公司,北京100007

出　　处：《油气地球物理》2018年第2期1-8,共8页Petroleum Geophysics

摘　　要：利用叠前纵波振幅随方位角的变化进行椭圆拟合估算裂缝发育方向和密度已得到广泛应用。提出"基圆"思想,利用裂缝不发育的标志层反射将不同方位的反射振幅校正到一个"基圆"上,从而消除由于观测方位角分布不均匀、偏移距分布不均匀及地表变化引起的椭圆拟合不适定性,提高裂缝参数的计算精度。实际资料处理表明,过井处的参数与裂缝测井的吻合度较高。The elliptical fitting of change of the prestack P wave amplitude with azimuth has been widely used to estimate the fracture development direction and density.In this paper,the idea of"base circle"is put forward.The reflection amplitudes of different azimuth are corrected to one"base circle"by the reflection of the undeveloped mark layer of the fracture,and eliminate the ill-posedness of the ellipse fitting caused by the uneven distribution of the observed azimuth angle,uneven offset distribution and surface change,the calculation accuracy of fracture parameter are improved.The real data processing shows that the parameters at the crossing well are in good agreement with the fracture log information.

关 键 词：叠前地震资料 裂缝检测 不适定性 基圆 

分 类 号：P618.130.2[天文地球—矿床学]